Intrasaccular Device Occlusion and Location Scale IDOL - a Novel Grading Scale For Cerebral Aneurysms Treated with Intrasaccular Devices

Background/Aims: Intrasaccular devices are an emerging treatment for cerebral aneurysms. However, current grading scales for outcome assessment are difficult to apply as device positioning is not taken into account. We present a novel grading scale to assess how likely a complete occlusion is predictale for cerebral aneurysms treated with intrasaccular devices. Materials: The scale was developed using results from 143 aneurysms treated at our institution with intrasaccular devices from 2019 to 2023. Angiographic images and clinical complications were taken to illustrate key aspects of the scale. Results: The scale considers device position relative to the parent artery and the aneurysm wall, contrast filling, neck coverage, and contrast inflow/stability. Conclusions: This scale helps standardize outcome measurements in accordance with the Modified Raymond–Roy Classification and O`Kelly Marotta grading scales, providing a basis for the common reporting of results.